The port to the Freescale/Motorola HC08 family has been added in October 2003, and is still undergoing some basic development. The code generator is complete, but the register allocation is still quite unoptimized. Some of the SDCC's standard C library functions have embedded non-HC08 inline assembly and so are not yet usable.
The HC08 port passes the regression test suite (see section 7.9).